If you look at Wikipedia article on the dam, we find the following: “It is located on the Tigris River in the western governorate of Ninawa, upstream of the city of Mosul. It is ranked as the fourth largest dam in the Middle East, measured by reserve capacity, capturing snow melt from Turkey, some 70 miles (110 km) north. Because the dam was constructed on a foundation of soluble gypsum, the engineers…